Sigma 50 Art (A-mount) on A73 + EA5

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M23 New Member • Posts: 3
Sigma 50 Art (A-mount) on A73 + EA5

I have a A-mount Sigma 50 Art , which is a HSM lens,
but I install it on my a7III with EA5, the autofocus simply can't work.
(It move in and out but simply cant on focus)

I have try the other Sigma HSM lens, the autofocus works when I install a Sigma 70-200mm f2.8 apo dg macro, which is a much older HSM lens. so I guess that it is not the problem of the EA5.

It is more interesting that I have seen a video on Youtube, and it seems that the Sigma 50 Art can work fine on EA5 with A7R4, so i wonder if it is a compatibility issues. I have search on Sigma Offical page, but there isn't any firmware update for A-mount version.

Is there any other method to solve it, or just keeping waiting for Sigma's firmware update..?

 M23's gear list:M23's gear list
Sony RX100 IV Sony Alpha DSLR-A700 Sony Alpha DSLR-A850 Sony a7 III Sigma 70-200mm F2.8 EX DG Macro HSM II +4 more
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